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SELECT lengthb(&apos;&#x590F;&#x4FAF;&#x747E;&#x8F69;&apos;)
  FROM dual;
--length(string)&#x8BA1;&#x7B97;string&#x6240;&#x5360;&#x7684;&#x5B57;&#x7B26;&#x957F;&#x5EA6;&#xFF1A;&#x8FD4;&#x56DE;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x957F;&#x5EA6;&#xFF0C;&#x5355;&#x4F4D;&#x662F;&#x5B57;&#x7B26;
SELECT length(&apos;&#x590F;&#x4FAF;&#x747E;&#x8F69;&apos;)
  FROM dual;
</code></pre>
<h2 id="&#x66FF;&#x6362;&#x5B57;&#x7B26;&#x4E32;&#xFF1A;replace&#x3001;translate">&#x66FF;&#x6362;&#x5B57;&#x7B26;&#x4E32;&#xFF1A;replace&#x3001;translate</h2>
<pre><code class="lang-plsql">---------------&#x66FF;&#x6362;&#x5B57;&#x7B26;&#x4E32;----------------- 
--replace &#x5C06;&#x590F;&#x4FAF;&#x66FF;&#x6362;&#x4E3A;&#x7455;&#x5BB6;
SELECT REPLACE(&apos;&#x590F;&#x4FAF;&#x747E;&#x8F69;&apos;,
               &apos;&#x590F;&#x4FAF;&apos;,
               &apos;&#x7455;&#x5BB6;&apos;)
  FROM dual;
--translate &#x5C06;&#x590F;&#x66FF;&#x6362;&#x4E3A;&#x5019;&#xFF0C;&#x747E;&#x66FF;&#x6362;&#x4E3A;&#x8F69; &#x4E00;&#x4E00;&#x5BF9;&#x5E94; 
--&#x82E5;&#x65E0;&#x5BF9;&#x5E94;&#x3002;&#x5982;
SELECT translate(&apos;&#x590F;&#x4FAF;&#x747E;&#x8F69;&apos;,
                 &apos;&#x590F;&#x747E;&apos;,
                 &apos;&#x5019;&#x8F69;&apos;)
  FROM dual;
--&#x82E5;&#x975E;&#x4E00;&#x4E00;&#x5BF9;&#x5E94;&#xFF0C;&#x5982;&#x4E0B;&#xFF0C;&#x5219;&#x82D7;&#x66FF;&#x6362;&#x4E3A;null
SELECT translate(&apos;&#x4E1C;&#x98CE;&#x8C37;&#x65E9;&#x82D7;&apos;,
                 &apos;&#x4E1C;&#x8C37;&#x82D7;&apos;,
                 &apos;&#x535A;&#x4E3D;&apos;)
  FROM dual;
</code></pre>
<h2 id="&#x622A;&#x53D6;&#x5B57;&#x7B26;&#xFF1A;substr">&#x622A;&#x53D6;&#x5B57;&#x7B26;&#xFF1A;substr</h2>
<pre><code class="lang-plsql">-------------&#x622A;&#x53D6;&#x5B57;&#x7B26;------------------- 
--&#x4ECE;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7B2C;3&#x4E2A;&#x5B57;&#x7B26;&#x5F00;&#x59CB;&#xFF08;&#x5305;&#x62EC;&#x7B2C;&#x4E09;&#x4E2A;&#xFF09;&#x622A;&#x53D6;5&#x4E2A;&#x5B57;&#x7B26;
SELECT substr(&apos;&#x4E00;&#x4E8C;&#x4E09;&#x56DB;&#x4E94;&#x516D;&#x4E03;&#x516B;&#x4E5D;&#x5341;&apos;,
              3,
              5)
  FROM dual;
</code></pre>
<h2 id="&#x67E5;&#x627E;&#x5B50;&#x4E32;&#xFF1A;instr">&#x67E5;&#x627E;&#x5B50;&#x4E32;&#xFF1A;instr</h2>
<pre><code class="lang-plsql">--------------&#x67E5;&#x627E;&#x5B50;&#x4E32;------------------ 
--&#x67E5;&#x627E;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x4ECE;1&#x5F00;&#x59CB;&#x7B2C;2&#x6B21;&#x51FA;&#x73B0;&apos;3&apos;&#x7684;&#x4F4D;&#x7F6E;
SELECT instr(&apos;123123123&apos;,
             &apos;3&apos;,
             1,
             2)
  FROM dual;
</code></pre>
<h2 id="&#x5341;&#x8FDB;&#x5236;&#x8F6C;&#x6362;&#xFF1A;ascii&#x3001;chr">&#x5341;&#x8FDB;&#x5236;&#x8F6C;&#x6362;&#xFF1A;ascii&#x3001;chr</h2>
<pre><code class="lang-plsql">-------------&#x5341;&#x8FDB;&#x5236;&#x8F6C;&#x6362; ascii&#x548C;chr------------------ 
SELECT ascii(&apos;A&apos;)
  FROM dual;
SELECT ascii(&apos;a&apos;)
  FROM dual;
SELECT chr(65)
  FROM dual;
SELECT chr(97)
  FROM dual;
</code></pre>
<h2 id="&#x5927;&#x5C0F;&#x5199;&#x8F6C;&#x6362;upper&#x3001;lower">&#x5927;&#x5C0F;&#x5199;&#x8F6C;&#x6362;:upper&#x3001;lower</h2>
<pre><code class="lang-plsql">---------------&#x5927;&#x5C0F;&#x5199;&#x8F6C;&#x6362;----------------- 
SELECT upper(&apos;kochiya sanae&apos;)
  FROM dual;
SELECT lower(&apos;KOCHIYA SANAE&apos;)
  FROM dual;
</code></pre>
<h2 id="trim">trim</h2>
<pre><code class="lang-plsql">--------------trim------------------ 
--&#x524D;&#x540E;&#x53BB;&#x7A7A;&#x683C;
SELECT TRIM(&apos; reimu &apos;)
  FROM dual;
--&#x53BB;&#x524D;&#x7F00; &#x4EC5;&#x80FD;&#x53BB;&#x9664;&#x4E00;&#x4E2A;&#x5B57;&#x7B26; &#x591A;&#x4E2A;&#x5B57;&#x7B26;&#x53EF;&#x7528;replace
--select trim (leading &apos;&#x590F;&#x5019;&apos; from &apos;&#x590F;&#x4FAF;&#x747E;&#x8F69;&apos; ) FROM DUAL;  --&#x62A5;&#x9519;
SELECT TRIM(leading &apos;&#x590F;&apos; FROM &apos;&#x590F;&#x590F;&#x4FAF;&#x747E;&#x8F69;&apos;)
  FROM dual;
--&#x53BB;&#x540E;&#x7F00;
SELECT TRIM(trailing &apos;&#x8F69;&apos; FROM &apos;&#x590F;&#x4FAF;&#x747E;&#x8F69;&#x8F69;&apos;)
  FROM dual;
--&#x53BB;&#x524D;&#x540E;&#x7F00;
SELECT TRIM(&apos;&#x7455;&apos; FROM &apos;&#x7455;&#x7455;&#x590F;&#x4FAF;&#x747E;&#x8F69;&#x7455;&apos;)
  FROM dual;
--rtrim &#x53BB;&#x53F3;&#x4FA7;&#x7A7A;&#x683C;
SELECT rtrim(&apos; reimu &apos;)
  FROM dual;
--ltrim &#x53BB;&#x5DE6;&#x4FA7;&#x7A7A;&#x683C;
SELECT ltrim(&apos; reimu &apos;)
  FROM dual;
</code></pre>
<h2 id="&#x5B57;&#x7B26;&#x8F6C;&#x6362;-convert">&#x5B57;&#x7B26;&#x8F6C;&#x6362; CONVERT</h2>
<p>&#x8BED;&#x6CD5;&#xFF1A;CONVERT( string1, char_set_to [, char_set_from] )</p>
<p>string1&#xFF1A;&#x8981;&#x8F6C;&#x6362;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<p>char_set_to&#xFF1A;&#x8981;&#x8F6C;&#x6362;&#x4E3A;&#x7684;&#x5B57;&#x7B26;&#x96C6;&#x3002;</p>
<p>char_set_from&#xFF1A;&#x53EF;&#x9009;&#x7684;&#xFF0C;&#x8981;&#x4ECE;&#x4E2D;&#x8F6C;&#x6362;&#x7684;&#x5B57;&#x7B26;&#x96C6;&#x3002;</p>
<pre><code class="lang-plsql">SELECT convert(&apos;&#x7F16;&#x7801;&#x6D4B;&#x8BD5;&apos;,
               &apos;AL32UTF8&apos;,
               &apos;ZHS16GBK&apos;)
  FROM dual;
</code></pre>
<h1 id="&#x81EA;&#x5B9A;&#x4E49;&#x51FD;&#x6570;">&#x81EA;&#x5B9A;&#x4E49;&#x51FD;&#x6570;</h1>
<h2 id="&#x6309;&#x5206;&#x9694;&#x7B26;&#x622A;&#x53D6;&#x90E8;&#x5206;&#x5B57;&#x6BB5;">&#x6309;&#x5206;&#x9694;&#x7B26;&#x622A;&#x53D6;&#x90E8;&#x5206;&#x5B57;&#x6BB5;</h2>
<pre><code class="lang-plsql">--&#x6309;&#x5206;&#x9694;&#x7B26;&#x622A;&#x53D6;&#x90E8;&#x5206;&#x5B57;&#x6BB5;
DECLARE
  l_number NUMBER := 10;
  l_split  VARCHAR2(10) := &apos;.&apos;;
  l_result VARCHAR2(1000);
  l_string VARCHAR2(32767) := &apos;&#x957F;&#x5B89;&#x6C11;&#x751F;&#x672C;&#x90E8;.&#x6574;&#x8F66;&#x4E8B;&#x4E1A;&#x90E8;-&#x804C;&#x80FD;&#x79D1;&#x5BA4;-&#x7EFC;&#x5408;&#x7BA1;&#x7406;&#x79D1;.&#x7BA1;&#x7406;&#x8D39;&#x7528;-&#x6298;&#x65E7;&#x8D39;.&#x65E0;&#x5B50;&#x76EE;.&#x65E0;&#x9879;&#x76EE;.&#x65E0;&#x5408;&#x540C;.&#x65E0;&#x4EA4;&#x6613;&#x65B9;.&#x65E0;&#x4E1A;&#x52A1;&#x7C7B;&#x578B;.&#x65E0;&#x5907;&#x7528;&#x6BB5;1.&#x65E0;&#x5907;&#x7528;&#x6BB5;2&apos;;
  FUNCTION get_split_string(p_string IN VARCHAR2,
                            p_split  IN VARCHAR2,
                            p_number IN NUMBER) RETURN VARCHAR2 IS
    l_spl_length NUMBER;
    l_start_num  NUMBER;
    l_end_num    NUMBER;
    l_string     VARCHAR2(32767);
    l_result     VARCHAR2(32767);
  BEGIN
    --&#x5BF9;&#x5934;&#x5C3E;&#x8FDB;&#x884C;&#x7279;&#x6B8A;&#x5904;&#x7406;&#xFF0C;&#x9632;&#x6B62;&#x622A;&#x53D6;&#x5934;&#x5C3E;&#x5B57;&#x7B26;&#x4E32;&#x51FA;&#x9519;
    l_string := p_split || p_string || p_split;
    dbms_output.put_line(&apos;&#x5904;&#x7406;&#x540E;&#x7684;&#x5B57;&#x7B26;&#x4E32;&apos; || l_string);
    --&#x83B7;&#x53D6;&#x5207;&#x5272;&#x7B26;&#x957F;&#x5EA6;
    l_spl_length := length(p_split);
    dbms_output.put_line(&apos;&#x5207;&#x5272;&#x7B26;&#x957F;&#x5EA6;&apos; || l_spl_length);
    --&#x83B7;&#x53D6;&#x5207;&#x5272;&#x8D77;&#x59CB;&#x4F4D;&#x7F6E;
    l_start_num := instr(l_string,
                         p_split,
                         1,
                         l_number);
    dbms_output.put_line(&apos;&#x8D77;&#x59CB;&#x4F4D;&#x7F6E;&apos; || l_start_num);
    --&#x83B7;&#x53D6;&#x5207;&#x5272;&#x7ED3;&#x5C3E;&#x4F4D;&#x7F6E;
    l_end_num := instr(l_string,
                       p_split,
                       1,
                       l_number + 1);
    dbms_output.put_line(&apos;&#x7ED3;&#x675F;&#x4F4D;&#x7F6E;&apos; || l_end_num);
    l_result := substr(l_string,
                       l_start_num + l_spl_length,
                       l_end_num - l_start_num - l_spl_length);
    RETURN l_result;
  END get_split_string;
BEGIN
  dbms_output.put_line(get_split_string(p_string =&gt; l_string,
                                        p_split  =&gt; l_split,
                                        p_number =&gt; l_number));
EXCEPTION
  WHEN OTHERS THEN
    dbms_output.put_line(&apos;&#x9519;&#x8BEF;&#x4EE3;&#x7801;&apos; || SQLCODE); --&#x5F53;&#x524D;&#x4F1A;&#x8BDD;&#x6267;&#x884C;&#x72B6;&#x6001;&#xFF0C;&#x9519;&#x8BEF;&#x7F16;&#x7801;
    dbms_output.put_line(&apos;&#x9519;&#x8BEF;&#x4FE1;&#x606F;&apos; || SQLERRM); --&#x5F53;&#x524D;&#x9519;&#x8BEF;&#x4FE1;&#x606F;
    dbms_output.put_line(dbms_utility.format_error_backtrace);
END;
</code></pre>

                                
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